title: Ultrathin planar graphene supercapacitors.
abstract: With the advent of atomically thin and flat layers of conducting materials such as graphene, new designs for thin film energy storage devices with good performance have become possible. Here, we report an "in-plane" fabrication approach for ultrathin supercapacitors based on electrodes comprised of pristine graphene and multilayer reduced graphene oxide. The in-plane design is straightforward to implement and exploits efficiently the surface of each graphene layer for energy storage. The open architecture and the effect of graphene edges enable even the thinnest of devices, made from as grown 1-2 graphene layers, to reach specific capacities up to 80 μFcm(-2), while much higher (394 μFcm(-2)) specific capacities are observed multilayer reduced graphene oxide electrodes. The performances of devices with pristine as well as thicker graphene-based structures are examined using a combination of experiments and model calculations. The demonstrated all solid-state supercapacitors provide a prototype for a broad range of thin-film based energy storage devices.
authors.affiliation: Department of Mechanical Engineering and Materials Science, Rice University, Houston, Texas, United States.
authors.forename: Jung Joon
authors.initials: JJ
authors.lastname: Yoo
authors.forename: Kaushik
authors.initials: K
authors.lastname: Balakrishnan
authors.forename: Jingsong
authors.initials: J
authors.lastname: Huang
authors.forename: Vincent
authors.initials: V
authors.lastname: Meunier
authors.forename: Bobby G
authors.initials: BG
authors.lastname: Sumpter
authors.forename: Anchal
authors.initials: A
authors.lastname: Srivastava
authors.forename: Michelle
authors.initials: M
authors.lastname: Conway
authors.forename: Arava Leela Mohana
authors.initials: AL
authors.lastname: Reddy
authors.forename: Jin
authors.initials: J
authors.lastname: Yu
authors.forename: Robert
authors.initials: R
authors.lastname: Vajtai
authors.forename: Pulickel M
authors.initials: PM
authors.lastname: Ajayan
mesh_terms: D025802:Electric Capacitance; D004581:Electronics / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006108:Graphite / Q000737:chemistry*; D008567:Membranes, Artificial; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*
chemical_list: D008567:Membranes, Artificial; D006108:Graphite